Composite transmission line



Patented Mar. 12, 1940 2,193,090 COMPOSITE TRAN SMI SSlON LINE. Flint 0.Elder, Cleveland Heights, Ohio No Drawlng.

Application April 14, 1936,

Serial No. 74,359

2 Claims.

The present invention relates to a composite transmission line for useas an overhead power cable and comprises a ferrous metal conductor corehaving a metal coating alloyed thereto and 5 subsequently cold-worked toprovide a yielding point having not less than 90 per cent of theultimate tensile strength of the material. 7

An object of the present invention is to provide a commsite wireconsisting of a ferrous metal core wherein the range of carbon is as lowas possible and the manganese content may be of the same range as thecarbon content but preferably as low as possible to increaseconductivity with a coating of one of the non-ferrous metals of theclass electro positive to iron with subsequent coldworking of thecomposite wire to produce a yielding point substantially that of theultimate tensile strength of the material.

The present invention resides in coating 9. car- 0 bon steel corewherein the range of carbon should be as low as possible but can extendfrom .01% to .50% but is preferably in the range between .01% to notover 0.24%. The range of manganese may be the same as the carbon butshould 5 be as low as possible in order to increase the conductivitythereof.

This conductor is then provided with an excessive amount of coating of ametal which may 1 be one of the non-ferrous metals of the class 0 whichare electro positive to iron in accordance with the method described inapplicant's Patent No. 2,049,834. After the required thickness of theultimate tensile strength of said conductor coating is applied to. theconductor, thecomposite wire is then cold-worked in any suitable 5manner and in so doing, produces a composite wire having a. yield pointfar greater than any of the known wires used for this purpose today andcarry a yield point of not less than 90 per cent of the ultimate tensilestrength thereof. By applying an excessive amount of coating onto theconductor before the cold drawing' operation, it is possible to producea high tensile conductor from low carbon steel having 5 a yield pointnot less than 90 per cent of its ultimate tensile strength so that theconductor, at finished size, will have the prescribed amount of coating.

While I have described one specific embodi- 1 ment of my invention,it,wi1l be understood that I do not wish to be limited exactly thereto,since various modifications may be made without departing from the scoreof my invention as defined by the following claims.

1. A conductor comprising a ferrous metal core having a heavy galvanizedcoating alloyed thereto, said conductor being cold-worked after coatingto raise its yield point to not less than 90 per cent of vthe ultimatetensile strength of said core and to provide a finished coating of anamplitude corresponding to that required on a similar wire but which hasbeen coated subsequent to coldworking.

2. A conductor comprising a ferrous metal core having a heavy galvanizedcoating alloyed thereto, said ferrous metal core having a carbon contentof less than .25 per cent and a manganese content equal to or less thanthe carbon content, said conductor being cold worked after coating toproduce a wire having high tensile strength and a yield point not lessthan per -cent of and a finished coating of an amplitude correspondingto that required on a similar wire but which has been coated subsequentto cold working.

FLINT C. ELDER.

